LA Synth Co now sells replacement contact strips for several old synths of this era. Very nice, very easy. Worked great for my Mono/Poly (which uses the same type of keybed as the Polysix...I can't speak for the Poly-61).

chipaudette wrote:LA Synth Co now sells replacement contact strips for several old synths of this era. Very nice, very easy.

This is the best long term option.

A graphite pencil works in a pinch, but is not a long term fix like replacing the membranes.

The original conductive pads have a very specific ohms resistance. Anything with ohms too low, like copper films or silver conductive pens, will cause key-on bouncing. That's a nasty double-triggering/stuttering of notes.

Have a word with Bob at Sounddoctorin - he sells kits made up of tiny carbon loaded pucks for repairing this style of keyboard. The same type of contacts are also found in the Juno 6/60/106 series and can be troublesome.